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RE: Very common to confuse the two.

Posted by Presto (A) on December 20, 2009 at 22:35:37

In Reply to: RE: Very common to confuse the two. posted by play-mate on December 17, 2009 at 18:58:08:

Playmate:

You need a measurement mic and small mixer with phantom (48V) power. I use a Behringer ECM8000 mic and a Behringer Eurorack UB802 mixer. For software, you need a MLS suite - something that will capture, at a minimum, the amplitude response of your system. You could record a sweep with a trial version of Adobe Audition, and then analyse the amplitude response. Or, you could try to get a copy of ETF which has limited but useful measurement capabilities in demo mode.

You will need to run sweeps of the system of each set of drivers individuall. In a two way, the midbasses by themselves, and tweets by themselves, one speakers at a time. For a three way, woofs, then mids, then tweets. A full range sweep will tell you little about where the crossover point is and what it's slopes are.

Then, you need to import the data as FRD files into Allocator and dial in the crossover point(s) that match up best with where the measured curves intersect. You also want to determing the slope of the curves. Basically, you want to enable an arbitrator curve for each crossover point that lays on top of what you have measured.

Manufacturers data for drivers is of no use. This will tell you nothing about the response on the specific baffles you are dealing with and what electrical filtering has been done.

The only time you could get into trouble is if the desiger chose to use asymmetrical slopes. If there are asymmetrical slopes, you may be in luck as the designer may have implemented a subtractive delay design and you are already transient perfect. But I would bet very few designers are using this method.

Cheers,
Presto

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